<template>
  <el-container class="home_container">
    <!-- 页面头部 -->
    <el-header>
      <div class="logo">
        <img src="../assets/logo.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
        <!-- 侧边栏 -->
      <el-aside width="200px">
          <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#545c64" text-color="#fff" 
        active-text-color="#409EFF" unique-opened router
        :default-active='activePath'
        >
          
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-location"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index=" '/'+subItem.path + '' " v-for="subItem in item.children" :key="subItem.id" @click="saveNavState( '/'+subItem.path )">
                <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
                </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>

      <!-- 右侧内容主体 -->
      <el-main>
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
      return {
          // 左侧菜单数据
          menulist : [],

          // 被激活的链接地址
          activePath : ''
      }
  },
  created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    }, 

    // 获取所有菜单
    async getMenuList() {
        const {data:res} = await this.$http.get('menus')
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        
    },

    // 保存链接的激活状态
    saveNavState(activePath) {
        window.sessionStorage.setItem('activePath',activePath)

    }
  }
};
</script>

<style lang="less" scoped>
.el-header {
  background-color: #444a5c;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
}
.home_container {
  width: 100%;
  height: 100%;
}
.el-aside {
  background-color: #333744;
  .el-menu {
      border-right: 0;
  }
}
.el-main {
//   background-color: skyblue;
}
.logo {
  width: 300px;
  height: 100%;
  position: relative;

  img {
    width: 20%;
    height: 100%;
  }

  span {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    margin-left: 15px;
    color: #fff;
  }
}
</style>